Why is the zip curved/humpy after insertion?
Check the sewing tension is equal on both sides of the zip. If this is only noticed after pressing heck for any high levels of shrinkage in the fabric material and any interlining.
Why is the colour of the slider or tape of the centre front zip different to the pocket zip?
If both zips are provided by Coats Opti they should match within a dE value of 1.2 in the specified light source. It maybe possible to see such differences but they should be within commercial tolerance. Check correct specified light source is being used and if there is still a concern refer to your Coats […]
Why is the zip is curved/humpy after pressing?
Spiral/coil zips have an S twist and Z twist in the teeth creating a “smile” or “frown” appearance when the teeth are joined. The left and right teeth should be both in the same direction/condition. If this is not the problem check the sewing tension is equal on both sides of the zip. Also check […]